Development of a fiber laser-based method to generate Cs-bearing microparticles from glass fiber filters

萩原 大樹  ; 小菅 淳 ; 斉藤 淳一  ; 浪江 将成 ; 木曽原 直之 ; 峰原 英介*; 坪井 昭彦 ; 石森 有 

Hagiwara, Hiroki; Kosuge, Atsushi; Saito, Junichi; Namie, Masanari; Kisohara, Naoyuki; Minehara, Eisuke*; Tsuboi, Akihiko; Ishimori, Yuu

To understand how Type-A Cs-bearing microparticles were generated at the Fukushima Daiichi nuclear power plant, identifying the materials from which these particles originated is important. In this study, we focus on a methodological approach for generating Cs-bearing microparticles by laser irradiation of glass-fibers-based filter materials, with the aim of producing surrogate particles under controlled laboratory conditions. To evaluate this approach, a series of experiments was conducted, including vapor-phase exposure and aqueous loading of Cs, Fe, and Zn onto filter substrates, followed by laser irradiation to induce rapid, localized high-temperature effects. Morphology and size distributions of the Cs-containing surrogate particles were found to be comparable to those reported for Type-A particles, within the scope of the applied analytical methods. Overall, a reproducible laboratory framework was established for producing Cs-bearing surrogate microparticles suitable for systematic characterization, while not aiming to fully reproduce specific accident conditions.